# Relationship history for MSHA mine 2101396

Current hierarchy: **Duininck Companies → Duininck, Inc. → Portable Wash Plant 1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Duininck Companies → Portable Wash Plant 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Komatz Construction Inc → Portable Wash Plant 1; 1950-01-01 to 1980-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Komatz Tom P → Portable Wash Plant 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Komatz Tom P → Komatz Construction Inc; 1950-01-01 to 1980-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Duininck, Inc. → Portable Wash Plant 1; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duininck Companies → Duininck, Inc.; 1980-08-01 to current/open; source msha-controller-operator-history